Engine Control System (4HK1) 1A-167
DTC P0381 (Flash Code 67)
Circuit Description
The glow indicator lamp is located on the instrument
panel (IP) cluster. The glow control system is operated
when the engine coolant temperature is low, which
allows easier engine starting. If the ignition switch is
turned ON when the engine coolant temperature is low,
the ECM illuminates the glow indicator lamp and turns
ON the glow plugs. After a fixed time passes, the ECM
turns OFF the glow indicator lamp and the glow plugs.
The ECM monitors the glow indicator lamp control
circuit for conditions that are incorrect for the
commanded state of the glow indicator lamp. For
example, a failure condition exists if the ECM detects
low voltage when the glow indicator lamp is
commanded OFF, or high voltage when the glow
indicator lamp is commanded ON. If the ECM detects
an improper voltage level on the control circuit, this
DTC will set.
Condition for Running the DTC
• The battery voltage is between 18 to 32 volts.
• The ignition switch is ON.
Condition for Setting the DTC
Either of following condition is met:
• The ECM detects a low voltage condition on the
glow indicator lamp control circuit for longer than 3
seconds when the lamp is commanded OFF.
• The ECM detects a high voltage condition on the
glow indicator lamp control circuit for longer than 3
seconds when the lamp is commanded ON.
Action Taken When the DTC Sets
• The ECM illuminates the SVS lamp when the
diagnostic runs and fails. Refer to DTC Type
Definitions for Action Taken When the DTC Sets -
Type C. (Euro 4 specification)
• The ECM illuminates the MIL when the diagnostic
runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
(Except Euro 4 specification)
Condition for Clearing the DTC
• Refer to DTC Type Definitions for Condition for
Clearing the SVS Lamp/ DTC - Type C. (Euro 4
specification)
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type A. (Except Euro 4
specification)
Diagnostic Aids
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.
Schematic Reference:
Engine Controls Schematics
Connector End View Reference:
Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0381
Step
Action
Value(s)
Yes
No
1
Did you perform the Diagnostic System Check
- Engine Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Engine Controls
2
1.
Verify whether the instrument panel (IP)
cluster is operational.
2.
Install a scan tool.
3.
Turn OFF the ignition for 30 seconds.
4.
Turn ON the ignition for 10 seconds.
5.
Start the engine.
6.
Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition?
—
Go to Step 3
Go to Diagnostic
Aids
3
1.
Turn OFF the ignition.
2.
Inspect the Meter (10A) fuse in the cab.
Is the Meter (10A) fuse open?
—
Go to Step 4
Go to Step 5
4
Replace the Meter (10A) fuse. If the fuse continues
to open, repair the short to ground on one of the
circuits that is fed by the Meter (10A) fuse or
replace the shorted attached component.
Did you complete the repair?
—
Go to Step 17
—
LG4HKED-WE-0871.book 167
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